From: Marc Kleine-Budde <mkl-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
To: Robin Holt <holt-sJ/iWh9BUns@public.gmane.org>
Cc: socketcan-core-0fE9KPoRgkgATYTw5x5z8w@public.gmane.org,
netdev-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
U Bhaskar-B22300 <B22300-KZfg59tc24xl57MIdRCFDg@public.gmane.org>,
Wolfgang Grandegger <wg-5Yr1BZd7O62+XT7JhA+gdA@public.gmane.org>
Subject: Re: [RFC 5/5] [powerpc] Implement a p1010rdb clock source.
Date: Mon, 08 Aug 2011 15:00:06 +0200 [thread overview]
Message-ID: <4E3FDDD6.1020802@pengutronix.de> (raw)
In-Reply-To: <20110808124842.GT4926-sJ/iWh9BUns@public.gmane.org>
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On 08/08/2011 02:48 PM, Robin Holt wrote:
>>> OK. Dug a bit more. The p1010 built-in clocksource seems to be the
>>> periphereal clock frequency which is system bus frequency divided
>>> by 2. The clock source can not be changed, but the clock divider can
>>> by freezing the interface and setting the CTRL register. This appears
>> Which bit(s) in the CTRL register is/are this?
> PRESDIV bits 24-31. Documented on the P1010 reference manual section 21.3.3.2.
We have and use these bits on arm, too. These bits are calculated and
set by the driver[1]. These bits are touched in freescale's 2.6.35
version of the flexcan driver, too.
From my point of view it makes no sense to specify this divider in the
OF-tree. We just need the frequency of the clock entering the flexcan
core. Which is, as you say, the system bus freq/2.
[1]
http://lxr.linux.no/linux+v3.0.1/drivers/net/can/flexcan.c#L597
--
Pengutronix e.K. | Marc Kleine-Budde |
Industrial Linux Solutions | Phone: +49-231-2826-924 |
Vertretung West/Dortmund | Fax: +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686 | http://www.pengutronix.de |
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next prev parent reply other threads:[~2011-08-08 13:00 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-06 14:34 [RFC 0/4] [flexcan] Add support for powerpc (freescale p1010) -V6 Robin Holt
2011-08-06 14:34 ` [RFC 2/5] [flexcan] Abstract off read/write for big/little endian Robin Holt
2011-08-06 14:34 ` [RFC 3/5] [flexcan] Add of_match to platform_device definition Robin Holt
[not found] ` <1312641270-6018-1-git-send-email-holt-sJ/iWh9BUns@public.gmane.org>
2011-08-06 14:34 ` [RFC 1/5] [flexcan] Replace mach/clock.h with linux/clkdev.h Robin Holt
2011-08-06 14:34 ` [RFC 4/5] [flexcan] Add support for FLEXCAN_DEBUG Robin Holt
2011-08-06 14:34 ` [RFC 5/5] [powerpc] Implement a p1010rdb clock source Robin Holt
[not found] ` <1312641270-6018-6-git-send-email-holt-sJ/iWh9BUns@public.gmane.org>
2011-08-08 8:37 ` Wolfgang Grandegger
[not found] ` <4E3FA066.3020301-5Yr1BZd7O62+XT7JhA+gdA@public.gmane.org>
2011-08-08 9:15 ` Robin Holt
2011-08-08 11:31 ` Robin Holt
[not found] ` <20110808113136.GS4926-sJ/iWh9BUns@public.gmane.org>
2011-08-08 12:07 ` Marc Kleine-Budde
[not found] ` <4E3FD184.1070706-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2011-08-08 12:48 ` Robin Holt
[not found] ` <20110808124842.GT4926-sJ/iWh9BUns@public.gmane.org>
2011-08-08 13:00 ` Marc Kleine-Budde [this message]
[not found] ` <4E3FDDD6.1020802-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2011-08-08 13:16 ` Wolfgang Grandegger
2011-08-08 13:08 ` Wolfgang Grandegger
[not found] ` <4E3FDFC9.7080508-5Yr1BZd7O62+XT7JhA+gdA@public.gmane.org>
2011-08-08 13:44 ` Marc Kleine-Budde
[not found] ` <4E3FE844.6090005-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2011-08-08 14:03 ` Robin Holt
[not found] ` <20110808140340.GV4926-sJ/iWh9BUns@public.gmane.org>
2011-08-08 14:19 ` Marc Kleine-Budde
[not found] ` <4E3FF068.6070905-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2011-08-08 14:29 ` Robin Holt
2011-08-08 14:19 ` Wolfgang Grandegger
2011-08-08 13:56 ` Robin Holt
[not found] ` <20110808135630.GU4926-sJ/iWh9BUns@public.gmane.org>
2011-08-08 14:16 ` Wolfgang Grandegger
[not found] ` <4E3FEFBB.9050103-5Yr1BZd7O62+XT7JhA+gdA@public.gmane.org>
2011-08-08 14:21 ` Robin Holt
[not found] ` <20110808142153.GW4926-sJ/iWh9BUns@public.gmane.org>
2011-08-08 14:37 ` Wolfgang Grandegger
[not found] ` <4E3FF4B8.2010603-5Yr1BZd7O62+XT7JhA+gdA@public.gmane.org>
2011-08-08 14:44 ` Robin Holt
[not found] ` <20110808144424.GY4926-sJ/iWh9BUns@public.gmane.org>
2011-08-08 14:59 ` Wolfgang Grandegger
[not found] ` <4E3FF9EA.6030601-5Yr1BZd7O62+XT7JhA+gdA@public.gmane.org>
2011-08-08 15:09 ` Robin Holt
[not found] ` <20110808150925.GA4926-sJ/iWh9BUns@public.gmane.org>
2011-08-08 15:18 ` Wolfgang Grandegger
[not found] ` <4E3FFE61.4090109-5Yr1BZd7O62+XT7JhA+gdA@public.gmane.org>
2011-08-08 15:22 ` Wolfgang Grandegger
[not found] ` <4E3FFF41.7030401-5Yr1BZd7O62+XT7JhA+gdA@public.gmane.org>
2011-08-08 15:38 ` Robin Holt
[not found] ` <20110808153835.GC4926-sJ/iWh9BUns@public.gmane.org>
2011-08-08 15:50 ` Wolfgang Grandegger
2011-08-08 15:23 ` Marc Kleine-Budde
2011-08-08 15:25 ` Robin Holt
[not found] ` <20110808152549.GB4926-sJ/iWh9BUns@public.gmane.org>
2011-08-08 15:27 ` Wolfgang Grandegger
2011-08-08 15:14 ` Marc Kleine-Budde
[not found] ` <4E3FFD5B.7080000-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2011-08-08 15:33 ` Wolfgang Grandegger
[not found] ` <4E4001E1.3030508-5Yr1BZd7O62+XT7JhA+gdA@public.gmane.org>
2011-08-08 15:55 ` Robin Holt
[not found] ` <20110808155540.GD4926-sJ/iWh9BUns@public.gmane.org>
2011-08-08 15:59 ` Robin Holt
2011-08-08 16:03 ` Wolfgang Grandegger
[not found] ` <4E4008BA.6030303-5Yr1BZd7O62+XT7JhA+gdA@public.gmane.org>
2011-08-08 16:08 ` Robin Holt
[not found] ` <20110808160810.GF4926-sJ/iWh9BUns@public.gmane.org>
2011-08-08 18:37 ` Wolfgang Grandegger
[not found] ` <4E402CF1.1040300-5Yr1BZd7O62+XT7JhA+gdA@public.gmane.org>
2011-08-08 19:14 ` Robin Holt
2011-08-08 20:27 ` Robin Holt
2011-08-08 18:53 ` Marc Kleine-Budde
2011-08-09 7:57 ` U Bhaskar-B22300
[not found] ` <9C64B7751C3BCA41B64A68E23005A7BE1B9D6C-TcFNo7jSaXPiTqIcKZ1S2K4g8xLGJsHaLnY5E4hWTkheoWH0uzbU5w@public.gmane.org>
2011-08-09 8:13 ` Marc Kleine-Budde
2011-08-09 9:34 ` U Bhaskar-B22300
[not found] ` <9C64B7751C3BCA41B64A68E23005A7BE1BEFCE-TcFNo7jSaXM0vywKSws3iq4g8xLGJsHaLnY5E4hWTkheoWH0uzbU5w@public.gmane.org>
2011-08-09 10:41 ` Wolfgang Grandegger
2011-08-09 8:32 ` Wolfgang Grandegger
2011-08-09 9:27 ` U Bhaskar-B22300
2011-08-09 10:48 ` Wolfgang Grandegger
[not found] ` <4E41108F.1090104-5Yr1BZd7O62+XT7JhA+gdA@public.gmane.org>
2011-08-09 12:41 ` U Bhaskar-B22300
[not found] ` <9C64B7751C3BCA41B64A68E23005A7BE1C3552-TcFNo7jSaXPiTqIcKZ1S2K4g8xLGJsHaLnY5E4hWTkheoWH0uzbU5w@public.gmane.org>
2011-08-09 12:49 ` Robin Holt
[not found] ` <20110809124919.GS4926-sJ/iWh9BUns@public.gmane.org>
2011-08-09 13:03 ` Wolfgang Grandegger
2011-08-09 13:17 ` Robin Holt
[not found] ` <4E413036.5080207-5Yr1BZd7O62+XT7JhA+gdA@public.gmane.org>
2011-08-09 13:35 ` Robin Holt
[not found] ` <20110809133531.GV4926-sJ/iWh9BUns@public.gmane.org>
2011-08-09 13:44 ` U Bhaskar-B22300
[not found] ` <9C64B7751C3BCA41B64A68E23005A7BE1C4746-TcFNo7jSaXPiTqIcKZ1S2K4g8xLGJsHaLnY5E4hWTkheoWH0uzbU5w@public.gmane.org>
2011-08-09 13:50 ` Robin Holt
2011-08-09 14:03 ` Wolfgang Grandegger
2011-08-09 14:09 ` Robin Holt
[not found] ` <20110809140901.GX4926-sJ/iWh9BUns@public.gmane.org>
2011-08-09 14:14 ` Wolfgang Grandegger
2011-08-09 12:50 ` Marc Kleine-Budde
[not found] ` <4E412D26.9020608-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
2011-08-09 12:54 ` U Bhaskar-B22300
2011-08-09 13:19 ` Wolfgang Grandegger
2011-08-08 14:48 ` Robin Holt
[not found] ` <20110808144808.GZ4926-sJ/iWh9BUns@public.gmane.org>
2011-08-08 15:16 ` Wolfgang Grandegger
2011-08-08 13:05 ` Marc Kleine-Budde
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